Strap for Calendrier

The Citizen Eco-Drive BU2021-51L features a lug width of 23 millimetres. This dimension is specific to Citizen's sports line and should be measured precisely using a digital calliper positioned at the inner shoulders of the lugs, where the strap rests.

For the BU2021-51L, we recommend an alligator strap with vegetable tanning in medium brown or slate grey, or alternatively a cognac open-pore calf strap. Alligator accentuates the reflection of the rotating bezel, whilst calf offers superior breathability. Both maintain the balance between the model's sporty character and refined appearance.

To replace the strap, use a spring bar removal tool to gently extract the two springs securing the strap to the lugs. Position the tool tip in the spring's lateral hole, push inward whilst simultaneously removing the old strap. Insert the new strap by aligning the holes with the lugs and reinserting the springs. Verify that the strap is secure before wearing the watch.

Yes, it is possible, but with caution. The 23mm lug width must be measured with precision (tolerance ±0.2mm). We recommend ordering artisanal straps specifically constructed for this width, as generic straps may have manufacturing tolerances that cause instability or premature lug wear.

A strap in vegetable-tanned leather, worn daily, has an average lifespan of 18–24 months before requiring replacement. This period varies depending on usage (exposure to perspiration, moisture, sunlight) and leather quality. Premium calf or alligator can reach 30 months if subjected to regular maintenance and protected from the most aggressive environmental factors.